Compilare: main.cpp: In function 'int main()': main.cpp:12:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i != max_len; ++i) ~~^~~~~~~~~~ main.cpp:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<strlen(str)-2;i++) ~^~~~~~~~~~~~~~ main.cpp:22:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(j=i+1;j<strlen(str)-1;j++) ~^~~~~~~~~~~~~~ main.cpp:10:9: warning: unused variable 'n' [-Wunused-variable] int n=1,i,j,k=0,max_len; ^ main.cpp:11:34: warning: 'max_len' may be used uninitialized in this function [-Wmaybe-uninitialized] char* str = new char[max_len + 1]; ~~~~~~~~^~~